CN210743771U

CN210743771U - Combined digital sensor

Info

Publication number: CN210743771U
Application number: CN201920646622.XU
Authority: CN
Inventors: 吴桂初; 许晓锋; 陈威; 陈勇
Original assignee: Zhejiang Juchuang Intelligent Technology Co Ltd
Current assignee: Zhejiang Juchuang Intelligent Technology Co ltd
Priority date: 2019-05-07
Filing date: 2019-05-07
Publication date: 2020-06-12
Anticipated expiration: 2029-05-07

Abstract

The utility model relates to a combined digital sensor, which comprises a shell, wherein the outer part of the shell is provided with an opening for an electric conductor to pass through, a circuit board is arranged in the shell, a current transformer and a residual current transformer which are used for detecting the current passing through the open conductor, a control processing unit which is used for processing the output signals of the current transformer and the residual current transformer, an interface of a temperature sensor which is used for monitoring the external temperature of the electric conductor in an inserting way, and an external interface which is used for providing a power supply and a communication source for an electric fire monitoring device are arranged on the circuit board, a ring-shaped iron core and a chip which are used for inducing the magnetic flux are arranged between the current transformer, the residual current transformer and the opening, the ring-shaped iron core is provided with a perforation, the electric conductor sequentially passes through the opening and the perforation, the shape of the through hole is square, and four corners of the through hole are rounded.

Description

Combined digital sensor

Technical Field

The invention relates to the field of low-voltage electricity, in particular to a current, residual current and temperature monitoring module of a low-voltage distributor, which relates to circuit data monitoring and prevents fire.

Background

Electrical fires have become an indispensable and important part of social production and life. According to relevant statistics, the electric fire occupies about 30% of the total number of fires and is the first of all fire types. Therefore, in order to ensure the safety of the electrical equipment, the electrical fire monitoring system is also gradually valued and applied, and becomes one of the important parts in the design of fire-fighting electrical equipment. The existing electric fire monitoring device mainly centers on monitoring of several core data, wherein the monitoring comprises residual current monitoring, temperature monitoring, current and voltage and electric energy monitoring and the like, wherein the monitoring of the current and the residual current mainly adopts a lead to be led out and placed in a current transformer and a residual current transformer of the monitoring device, and the electromagnetic induction effect is utilized to measure the current and the residual current. However, the current sensor, the residual current and the controller of the existing electric fire monitoring device are large in size, low in measurement precision, difficult to install and large in test error, and the mutual inductor cannot achieve good balance in magnetic permeability and wire shape adaptability.

Disclosure of Invention

The utility model discloses a solve the not enough of above-mentioned technique, provide a low pressure distributor current monitoring module.

In order to solve the technical problem, the fire alarm device comprises a shell, wherein an opening for allowing a conductor to pass is formed in the outer portion of the shell, a current transformer and a residual current transformer for detecting current and residual current are arranged in the shell, a control processing unit for processing output signals of the current transformer and the residual current transformer is used for plugging and monitoring a temperature sensor of the outer temperature of the conductor, and an external interface for providing a power supply and a communication source for an electrical fire monitoring device.

After having adopted above-mentioned structure, in prior art, the shape of opening and perforation is oval or square setting, but in the actual application in-process, oval opening and perforation setting can't satisfy the great electric conductor of area, must enlarge whole opening and the diameter of perforation and just can match, and whole application object is less, and square area is great under the same size, but because the electric conductor is circular shape usually, so square shape can lead to whole utilization ratio not high. And adopt square and four square angle fillets' processing in this patent, can obtain the advantage that above-mentioned two embodiments brought simultaneously, both satisfied area utilization and rateed high and satisfied the wide technical requirement of adaptation object.

As a further improvement, the annular iron core is made of silicon steel sheets.

After the structure is adopted, the silicon steel is a magnetic substance with strong magnetic conductivity, can generate larger magnetic induction intensity, and can greatly enhance the detection precision of the current transformer and the residual current transformer by adopting the silicon steel sheet as the annular iron core.

As a further improvement of the utility model, through a support interconnect between annular iron core and the circuit board, the shape and the size of support are unanimous with annular iron core to annular iron core adopts the hot riveting mode with the support to be connected.

After the structure is adopted, the gap of the annular core body is an air gap which is a measuring space used for measuring magnetic flux, the density of magnetic induction lines is directly determined by the size of the air gap, if the size of the air gap is too large or too small, the detection precision is influenced, under the condition of multiple times of experimental work and rated current of 80 amperes, the air gap distance is 1.8-2.5 millimeters, and the working efficiency of the annular iron core is optimal. And adopt the mode of hot riveting with the support, the connection effect is better, has improved annular iron core's life.

As a further improvement, the casing includes casing and lower casing, go up the casing and be swing joint down between the casing, upward the interior jade department circumference of casing is provided with T type sliding plug spare, jade department circumference is provided with trapezoidal slot down in the casing, when going up casing and casing cooperation down and being connected, T type sliding plug spare peg graft and cooperate in trapezoidal slot.

After having adopted above-mentioned structure, owing to adopt trapezoidal slot and sliding plug spare to play the guide effect when the assembly, the cooperation of pegging graft is carried out along trapezoidal slot to the sliding plug spare, sets up like this and changes the slip when the cooperation at upper and lower casing to the product dismouting, the internal component is maintained and is changed.

Drawings

FIG. 1 is a front view of the present patent;

FIG. 2 is a front view of the present patent;

FIG. 3 is an exploded view of the present patent;

FIG. 4 is a schematic view of a toroidal core construction;

FIG. 5 is a schematic view of the upper housing;

fig. 6 is a schematic view showing the structure of the lower case.

Detailed Description

As shown in fig. 1-4, the fire monitoring device comprises a casing 1, an opening 11 for passing an electric conductor is arranged outside the casing 1, a current transformer 4 for detecting current and a residual current transformer 5 for detecting residual current are arranged in the casing 1, a control processing unit for processing output signals of the current transformer 2 and the residual current transformer 5, an interface 3 for plugging a temperature sensor for monitoring the temperature outside the electric conductor, and an external interface 6 for providing power supply and communication source for an electric fire monitoring device, wherein the current transformer 4 comprises a ring-shaped iron core 41 and a chip 42 for inducing magnetic flux, the ring-shaped iron core 41 is provided with a perforation 411, the electric conductor passes through the opening 11 and the perforation 411 in sequence, the opening 11 is square, the residual current transformer 5 is an induction coil 5, four corners of the opening 11 are chamfered, and the perforation 411 is square, and four corners of the penetration hole 411 are rounded. In the prior art, the openings 11 and the through holes 411 are formed in an oval shape or a square shape, but in the actual application process, the oval openings 11 and the through holes 411 cannot meet the requirement of a conductor with a large area, the diameter of the whole opening 11 and the diameter of the through holes 411 must be enlarged to match the conductor, the whole application objects are few, and the square has a large area under the same size, but the conductor is usually in a circular shape, so that the whole utilization rate is low due to the square shape. And adopt square and four square angle fillets' processing in this patent, can obtain the advantage that above-mentioned two embodiments brought simultaneously, both satisfied area utilization and rateed high and satisfied the wide technical requirement of adaptation object.

The annular iron core 4 is made of silicon steel sheets. The silicon steel is a magnetic substance with strong magnetic conductivity, and the detection precision of the current transformer and the residual current transformer can be greatly enhanced by adopting the silicon steel sheet as the annular iron core. The annular iron core 4 is provided with gap openings, and the gap distance between the gap openings 42 ranges from 1.8 mm to 2.5 mm. The gap of the annular core body is an air gap which is a measuring space used for measuring magnetic flux, the size of the air gap directly determines the density of magnetic induction lines, if the air gap is too large or too small, the detection precision is affected, under the condition of multiple times of experimental work and rated current of 80 amperes, the air gap distance is 1.8-2.5 millimeters, and the working efficiency of the annular iron core 4 is optimal. The annular iron core is connected with the circuit board through a support 44, the shape and the size of the support 44 are consistent with those of the annular iron core, and the annular iron core is connected with the support in a hot riveting mode. And the annular iron core and the bracket 44 are in a hot riveting mode, so that the connection effect is better, and the service life of the annular iron core 4 is prolonged.

Casing 1 includes casing 12 and lower casing 13, for swing joint between casing 12 and the lower casing 13, it is provided with T type sliding plug 121 to go up interior jade department circumference of casing 12, jade department circumference is provided with trapezoidal slot 131 in the lower casing 13, when going up casing 12 and lower casing 13 cooperation and being connected, T type sliding plug 121 plug-in fit is in trapezoidal slot 131. Because adopt trapezoidal slot 131 and slip plug member 121 can play the guide effect when the assembly, slip plug member 121 carries out the grafting cooperation along trapezoidal slot 131, sets up like this and is changeing the slip when the cooperation at upper and lower casing to the product dismouting, the internal component is maintained and is changed. This patent can be according to the different phase numbers that set up of wiring and jack quantity in order to match different load voltage.

Claims

1. Modular digital sensor, including the casing, the casing outside is provided with the opening that supplies the electric conductor to pass, be provided with the circuit board in the casing, be provided with current transformer and the residual current transformer that is used for detecting the electric current of passing on the opening conductor on the circuit board, be used for handling current transformer and residual current transformer output signal's control processing unit, be used for pegging graft the temperature sensor's of monitoring electric conductor external temperature interface to and provide the external interface of power and communication source for electric fire monitoring devices, current transformer is including the toroidal core and the chip of response magnetic flux, toroidal core is provided with the perforation, and the electric conductor passes opening and perforation in proper order, residual current transformer includes induction coil, its characterized in that: the shape of the opening is square, and four corners of the opening are rounded, and the shape of the through hole is square, and four corners of the through hole are rounded.

2. The combined digital sensor according to claim 1, wherein: the annular iron core is made of silicon steel sheets.

3. The combined digital sensor according to claim 1 or 2, wherein: the annular iron core is provided with gap openings, the range of gap distance between the gap openings is 1.8-2.5 mm, and the chip is a Hall chip placed in the gap.

4. The combined digital sensor according to claim 3, wherein: the annular iron core is connected with the circuit board through a support, the shape and the size of the support are consistent with those of the annular iron core, and the annular iron core is connected with the support in a hot riveting mode.

5. The combined digital sensor according to claim 1 or 4, wherein: the casing includes casing and lower casing, go up the casing and be swing joint down between the casing, it is provided with "T" type sliding plug piece to go up interior jade department circumference of casing, jade department circumference is provided with trapezoidal slot down in the casing, when going up casing and casing cooperation connection down, "T" type sliding plug piece plug-in fit in trapezoidal slot.